Question

50-{4.2+[12:3+(2.2+1)+3]}=

Answer 1

50-{4.2+[12:3+(2.2+1)+3]}=
50-{4.2+[12:3+(4+1)+3]}=
50-{4.2+[12:3+5+3]}=
50-{4.2+[4+5+3]}=
50-{4.2+[9+3]}=
50-{4.2+12}=
50-{8+12}=
50-20=
30